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You searched for: subject:"FUZZY SYSTEMS"
[texts]Fuzzy logic, estimated null values and their application in relational databases - Powell, Susan E.
This volume was digitized and made accessible online due to deterioration of the original print copy.
Keywords: Fuzzy systems--Design; Database management; Computer software--Development
Downloads: 24
[texts]Natural systems for wastewater treatment and water reuse for space and earthly applications - Wolverton, B. C
The technology for using artificial marsh systems for upgrading domestic sewage effluent from primary settling tanks and/or facultative or aerated lagoons has been sufficiently developed to meet secondary and advanced secondary levels of treatment in the Southern U.S. Artificial marshes using emergent plants such as the bulrush combined with duckweed are also developed to the level of being a promising alternative wastewater treatment system for temperate areas throughout most of the U.S...
Keywords: CONTROL SYSTEMS DESIGN; CONTROLLERS; DYNAMICAL SYSTEMS; FUZZY SYSTEMS; LOGIC DESIGN; AUTOMATIC CONTROL; PENDULUMS; TERMINOLOGY
Downloads: 110
[texts]High Acceleration, High Life Cycle, Reusable In-Space Main Engine: 2000-2004 - NON
This custom bibliography from the NASA Scientific and Technical Information Program lists a sampling of records found in the NASA Aeronautics and Space Database. The scope of this topic includes technologies for the crew exploration vehicle. This area of focus is one of the enabling technologies as defined by NASA s Report of the President s Commission on Implementation of United States Space Exploration Policy, published in June 2004.
Keywords: AEROSPACE ENGINEERING; ROTARY WING AIRCRAFT; PREDICTION ANALYSIS TECHNIQUES; DISPLAY DEVICES; PROTECTION; NEURAL NETS; FUZZY SYSTEMS
Downloads: 73
[texts]Nickel hydrogen capacity loss - Goualard, Jacques
The results of tests to assess capacity loss in nickel hydrogen cells are presented in outline form. The effects of long storage (greater than 1 month), high hydrogen pressure storage, high cobalt content, and recovery actions are addressed.
Keywords: CONTROL SYSTEMS DESIGN; CONTROLLERS; FUZZY SYSTEMS; GENETIC ALGORITHMS; EQUATIONS OF MOTION; OPTIMIZATION
Downloads: 87
[texts]New Orleans drinking water project: Summary of first year effort and conclusion - Wolverton, B. C.
In 1983, the state of Louisiana's Office of Public Works requested assistance from NASA to develop an efficient, cost effective system for removing trace levels of toxic and undesirable chemicals from Mississippi River water at New Orleans prior to final processing of the water for potable use. The subsequent agreement reached provided for NASA to perform consulting services to the state as well as basic research necessary to design and operate a biological treatment system...
Keywords: CONTROL SYSTEMS DESIGN; FUZZY SYSTEMS; LOGIC DESIGN; RAIL TRANSPORTATION; CONTROLLERS; INFERENCE
Downloads: 72
[texts]MPD work at MIT - Martinez-Sanchez, Manue
MPD work at MIT is presented in the form of the view-graphs. The following subject areas are covered: the MIT program, its goals, achievements, and roadblocks; quasi one-dimensional modeling; two-dimensional modeling - transport effects and Hall effect; microscopic instabilities in MPD flows and modified two stream instability; electrothermal stability theory; separation of onset and anode depletion; exit plane spectroscopic measurements; phenomena of onset as performance limiter; explanations o...
Keywords: ARTIFICIAL INTELLIGENCE; INFORMATION SYSTEMS; KNOWLEDGE BASES (ARTIFICIAL INTELLIGENCE); LEARNING; DATA STORAGE; FUZZY SYSTEMS; INFERENCE; KNOWLEDGE REPRESENTATION
Downloads: 119
[texts]Turbulence modeling - Shih, Tsan-Hsin
The performance of existing two-equation eddy viscosity models was examined. An effort was made to develop better models for near-wall turbulence using direct numerical simulations of plane channel and boundary layer flows. The asymptotic near-wall behavior of turbulence was used to examine the problems of current second order closure models and develop new models with the correct near-wall behavior...
Keywords: ACTUATORS; COLOR TELEVISION; DATA STORAGE; RANDOM ACCESS MEMORY; VIDEO DATA; FUZZY SYSTEMS; HIGH RESOLUTION
Downloads: 135
[texts]A study of interior landscape plants for indoor air pollution abatement - Wolverton, B. C.
Previously, preliminary data on the ability of a group of common indoor plants to remove organic chemical from indoor air was presented. The group of plants chosen for this study was determined by joint agreement between NASA and the Associated Landscape Contractors of America. The chemicals chosen for study were benzene, trichloroethylene, and formaldehyde. The results show that plants can play a major role in removal of organic chemicals from indoor air.
Keywords: ARTIFICIAL INTELLIGENCE; FUZZY SETS; FUZZY SYSTEMS; NEURAL NETS; SET THEORY; DYNAMICAL SYSTEMS; MACHINE LEARNING; TRACKING (POSITION)
Downloads: 1,652
[texts]Synthesis and Characterization of Polyimides with Ether Linkages - Chuang, Kathy C.
A series of polyimides derived from a newly synthesized diamine, namely, 4,4-bis(4-aminophenoxy)-2,2-dimethylbiphenyl (BAPD), were developed and characterized. Their physical and thermal properties were compared to polyimides based on'commercially available 2,2-bis(4-(4-aminophenoxy)phenyl)propane (BAPP).
Keywords: FUZZY SYSTEMS; FAULT TOLERANCE; EXPERT SYSTEMS; WATER MANAGEMENT; WATER RECLAMATION; WATER FLOW
Downloads: 198
[texts]Combined In-Plane and Through-the-Thickness Analysis for Failure Prediction of Bolted Composite Joints - Kradinov, V.
Although two-dimensional methods provide accurate predictions of contact stresses and bolt load distribution in bolted composite joints with multiple bolts, they fail to capture the effect of thickness on the strength prediction. Typically, the plies close to the interface of laminates are expected to be the most highly loaded, due to bolt deformation, and they are usually the first to fail. This study presents an analysis method to account for the variation of stresses in the thickness directio...
Keywords: APPLICATIONS OF MATHEMATICS; GENOME; GENETICS; PROTEINS; RIBONUCLEIC ACIDS; DEOXYRIBONUCLEIC ACID; TRANSCRIPTION (GENETICS); YEAST; FUZZY SYSTEMS
Downloads: 62
[texts]Atomic Data and Spectral Line Intensities for Ni XXI - Bhatia, A. K.
Electron impact collision strengths, energy levels, oscillator strengths and spontaneous radiative decay rates are calculated for Ni XXI. The configurations used are 2s(sup 2)2p(sup 4), 2s2p(sup 5), 2p(sup 6), 2s(sup 2)2p(sup 3)3s, and 2s(sup 2)3p(sup 3)3d giving rise to 58 fine-structure levels in intermediate coupling. Collision strengths are calculated at five incident energies, 85, 170, 255, 340, and 425 Ry...
Keywords: FLIGHT SIMULATORS; VERTICAL MOTION SIMULATORS; PILOT PERFORMANCE; ACCURACY; FEEDBACK CONTROL; FUZZY SYSTEMS
Downloads: 59
[texts]Management of the Space Station Freedom onboard local area network - Miller, Frank W.
An operational approach is proposed to managing the Data Management System Local Area Network (LAN) on Space Station Freedom. An overview of the onboard LAN elements is presented first, followed by a proposal of the operational guidelines by which management of the onboard network may be effected. To implement the guidelines, a recommendation is then presented on a set of network management parameters which should be made available in the onboard Network Operating System Computer Software Config...
Keywords: ARCHITECTURE (COMPUTERS); EXPERT SYSTEMS; FUZZY SYSTEMS; PARALLEL PROCESSING (COMPUTERS); ARTIFICIAL INTELLIGENCE; CONTROL THEORY; FUZZY SETS
Downloads: 83
[texts]Sensor Needs for Control and Health Management of Intelligent Aircraft Engines - Simon, Donald L.
NASA and the U.S. Department of Defense are conducting programs which support the future vision of ''intelligent'' aircraft engines for enhancing the affordability, performance, operability, safety, and reliability of aircraft propulsion systems. Intelligent engines will have advanced control and health management capabilities enabling these engines to be self-diagnostic, self-prognostic, and adaptive to optimize performance based upon the current condition of the engine or the current mission o...
Keywords: NUMERICAL ANALYSIS; DESIGN ANALYSIS; FUZZY SYSTEMS; CONTROLLERS; LOGIC DESIGN; TUNING; SPACECRAFT INSTRUMENTS; POINTING CONTROL SYSTEMS; MEMBERSHIP FUNCTIONS; LINE OF SIGHT
Downloads: 89
[texts]Stiffness and strength tailoring in uniform space-filling truss structures - Lake, Mark S
This paper presents a deterministic procedure for tailoring the continuum stiffness and strength of uniform space-filling truss structures through the appropriate selection of truss geometry and member sizes (i.e., flexural and axial stiffnesses and length). The trusses considered herein are generated by replication of a characteristic truss cell uniformly through space. The repeating cells are categorized by one of a set of possible geometric symmetry groups derived using the techniques of crys...
Keywords: ARTIFICIAL INTELLIGENCE; CONFERENCES; EXPERT SYSTEMS; TECHNOLOGY UTILIZATION; DISTRIBUTED PROCESSING; FUZZY SYSTEMS; KNOWLEDGE REPRESENTATION; LOGIC PROGRAMMING; NEURAL NETS
Downloads: 111
[texts]Don't waste waterweeds - Wolverton, Bill C.
Experiments carried out at the NASA National Space Technology Laboratories indicate that water hyacinths can absorb organic chemicals, heavy metals, nutrients, and other materials from waste water while producing large quantities of biomass, which can be used to produce a gas containing 60-80 percent methane. When grown in sewage free of toxic materials, the biomass can be used as a potential source of fertilizer or animal feed supplements...
Keywords: AUTOMATIC CONTROL; RESCUE OPERATIONS; FLIGHT CONTROL; FUZZY SYSTEMS; HELICOPTER CONTROL; HOVERING; AUTOROTATION; ENGINE FAILURE; RADIO CONTROL; REMOTE CONTROL
Downloads: 97
[texts]Development and application of an acceptance testing model - Pendley, Rex D.
The process of acceptance testing large software systems for NASA has been analyzed, and an empirical planning model of the process constructed. This model gives managers accurate predictions of the staffing needed, the productivity of a test team, and the rate at which the system will pass. Applying the model to a new system shows a high level of agreement between the model and actual performance...
Keywords: ERROR CORRECTING CODES; FUZZY SYSTEMS; PETRI NETS; ROBOTICS; TASK PLANNING (ROBOTICS); FEASIBILITY; RELIABILITY ANALYSIS; ROBOT SENSORS; VIABILITY
Downloads: 83
[texts]Thermal Effects on the Bearing Behavior of Composite Joints - Walker, Sandra Polesk
Thermal effects on the pin-bearing behavior of an IM7/PET15 composite laminate are studied comprehensively. A hypothesis presents factors influencing a change in pin-bearing strength with a change in temperature for a given joint design. The factors include the change in the state of residual cure stress, the material properties, and the fastener fit with a change in temperature. Experiments are conducted to determine necessary lamina and laminate material property data for the IM7/PET15 being u...
Keywords: ARTIFICIAL INTELLIGENCE; ENVIRONMENTAL QUALITY; MICROGRAVITY; MONITORS; VIBRATION MEASUREMENT; INTERNATIONAL SPACE STATION; MICROELECTROMECHANICAL SYSTEMS; FUZZY SYSTEMS; VECTOR QUANTIZATION
Downloads: 112
[texts]Airbreathing Hypersonic Technology Vision Vehicles and Development Dreams - McClinton, C. R.
Significant advancements in hypersonic airbreathing vehicle technology have been made in the country's research centers and industry over the past 40 years. Some of that technology is being validated with the X-43 flight tests. This paper presents an overview of hypersonic airbreathing technology status within the US, and a hypersonic technology development plan. This plan builds on the nation's large investment in hypersonics...
Keywords: APPROACH CONTROL; FUZZY SYSTEMS; ARTIFICIAL INTELLIGENCE; PILOTLESS AIRCRAFT; AUTOMATIC CONTROL; AUTONOMY; EXPERT SYSTEMS; ROVING VEHICLES; ROBOTS; NEURAL NETS
Downloads: 91
[texts]Weight and the Future of Space Flight Hardware Cost Modeling - Prince, Frank A
Weight has been used as the primary input variable for cost estimating almost as long as there have been parametric cost models. While there are good reasons for using weight, serious limitations exist. These limitations have been addressed by multi-variable equations and trend analysis in models such as NAFCOM, PRICE, and SEER; however, these models have not be able to address the significant time lags that can occur between the development of similar space flight hardware systems...
Keywords: GEAR TEETH; MULTISENSOR FUSION; FATIGUE TESTS; DECISION MAKING; PITTING; SENSORS; WEAR; SYSTEMS HEALTH MONITORING; SPIRAL BEVEL GEARS; SYSTEMS INTEGRATION; VIBRATION MEASUREMENT; OILS; DAMAGE; ALGORITHMS; FUZZY SYSTEMS
Downloads: 86
[texts]A user view of the EURECA ground segment - Ferri, Paolo
The European Retrievable Carrier (EURECA) was launched on 31 Jul. 1992. It is the largest ESA spacecraft ever launched, and the first one to be launched and retrieved by the NASA Space Shuttle. This paper describes the lessons learned during the first months of utilization of the EURECA ground segment from the point of view of the flight control team.
Keywords: CONTROL SYSTEMS DESIGN; KNOWLEDGE BASES (ARTIFICIAL INTELLIGENCE); MATHEMATICAL MODELS; CONTROLLERS; FUZZY SYSTEMS; HEURISTIC METHODS; LOGIC CIRCUITS; MACHINE LEARNING; NEURAL NETS; COMPLEX SYSTEMS; CONTROL THEORY
Downloads: 64
[texts]General object-oriented software development: Background and experience - Seidewitz, E
The effective use of Ada requires the adoption of modern software-engineering techniques such as object-oriented methodologies. A Goddard Space Flight Center Software Engineering Laboratory Ada Pilot Project has provided an opportunity for studying object-oriented design in Ada. The project involves the development of a simulation system in Ada in parallel with a similar FORTRAN development. As part of the project, the Ada development team trained and evaluated object-oriented and process-orient...
Keywords: ATTITUDE CONTROL; FUEL CONSUMPTION; INERTIA; SPACECRAFT MANEUVERS; CONTROLLERS; FLEXIBLE SPACECRAFT; FLIGHT CONTROL; FUZZY SYSTEMS; SPACE SHUTTLE ORBITERS; SPACE TRANSPORTATION SYSTEM FLIGHTS; SPACECRAFT CONTROL; THRUSTORS
Downloads: 86
[texts]Prosthetic elbow joint - NON
An artificial, manually positionable elbow joint for use in an upper extremity, above-elbow, prosthetic is described. The prosthesis provides a locking feature that is easily controlled by the wearer. The instant elbow joint is very strong and durable enough to withstand the repeated heavy loadings encountered by a wearer who works in an industrial, construction, farming, or similar environment. The elbow joint of the present invention comprises a turntable, a frame, a forearm, and a locking ass...
Keywords: FUZZY SYSTEMS; BOOLEAN ALGEBRA; COMPUTERIZED SIMULATION; MATHEMATICAL LOGIC; MATHEMATICAL MODELS; PILOT PERFORMANCE; SPACE RENDEZVOUS; SPACE SHUTTLES; SPACE STATIONS; SPACE TRANSPORTATION SYSTEM FLIGHTS; SPACECRAFT DOCKING
Downloads: 151
[texts]Searching the ASRS Database Using QUORUM Keyword Search, Phrase Search, Phrase Generation, and Phrase Discovery - McGreevy, Michael W
To support Search Requests and Quick Responses at the Aviation Safety Reporting System (ASRS), four new QUORUM methods have been developed: keyword search, phrase search, phrase generation, and phrase discovery. These methods build upon the core QUORUM methods of text analysis, modeling, and relevance-ranking. QUORUM keyword search retrieves ASRS incident narratives that contain one or more user-specified keywords in typical or selected contexts, and ranks the narratives on their relevance to th...
Keywords: ALGORITHMS; ASTRONAUTS; EMBEDDING; EMERGENCIES; FUZZY SYSTEMS; ILLUMINATING; IMAGE ANALYSIS; KNOWLEDGE REPRESENTATION; LOGIC CIRCUITS; PROTOTYPES; ANOMALIES; COMPUTERS; DEFECTS; DETECTION; IMAGING TECHNIQUES; MACHINE LEARNING; REAL TIME OPERATION; SPACE SHUTTLE ORBITERS
Downloads: 86
[texts]JavaGenes: Evolving Graphs with Crossover - Globus, Al
Genetic algorithms usually use string or tree representations. We have developed a novel crossover operator for a directed and undirected graph representation, and used this operator to evolve molecules and circuits. Unlike strings or trees, a single point in the representation cannot divide every possible graph into two parts, because graphs may contain cycles. Thus, the crossover operator is non-trivial...
Keywords: AERODYNAMIC CHARACTERISTICS; FREQUENCIES; FORCED VIBRATION; FLIGHT SIMULATION; DYNAMIC RESPONSE; ALGORITHMS; AERODYNAMIC CONFIGURATIONS; F-16 AIRCRAFT; FUZZY SYSTEMS; FLIGHT CHARACTERISTICS; UNSTEADY AERODYNAMICS; MODELS; COMPUTERIZED SIMULATION; YAW; STABILITY; ROLL; OSCILLATIONS
Downloads: 80
[texts]Heating Structures Derived from Satellite - Tao, W.-K.
Rainfall is a key link in the hydrologic cycle and is a primary heat source for the atmosphere. The vertical distribution of latent-heat release, which is accompanied by rainfall, modulates the large-scale circulations of the tropics and in turn can impact midlatitude weather. This latent heat release is a consequence of phase changes between vapor, liquid, and solid water. The Tropical Rainfall Measuring Mission (TRMM), a joint U.S./Japan space project, was launched in November 1997...
Keywords: APPLICATIONS PROGRAMS (COMPUTERS); ARTIFICIAL INTELLIGENCE; FUZZY SYSTEMS; SOFTWARE DEVELOPMENT TOOLS; TECHNOLOGY UTILIZATION; SOFTWARE ENGINEERING; SYSTEMS INTEGRATION; OPERATING SYSTEMS (COMPUTERS); COMPUTER PROGRAMMING; COMPUTER NETWORKS; ARCHITECTURE (COMPUTERS); NEURAL NETS
Downloads: 60
[texts]New Collection of Articles at PlanetPhysics.org : C to F entries - bci1
An alphabetically ordered collection of articles generated with Noosphere version 1.0 at PlanetPhysics.org : C to F entries. See also: http://planetphysics.us/ and the wiki version of planetphysics.org from: http://planetphysics.org/wikipl http://pp-wiki.metameso.org/wiki.pl (Coming soon also http://pp-dev.org/encyclopedia and a book of PlanetPhysics Encyclopedia)
Keywords: quantum concepts and theories, complexity, chemical imaging techniques, chemical thermodynamics, category theory applications in physics, `fuzzy' systems in biology, fundamental concepts and Laws of Physics
Downloads: 71
[texts]Nacelle Integration to Reduce the Sonic Boom of Aircraft Designed to Cruise at Supersonic Speeds - Mack, Robert J
An empirical method for integrating the engine nacelles on a wing-fuselage-fin(s) configuration has been described. This method is based on Whitham theory and Seebass and George sonic-boom minimization theory, With it, both reduced sonic-boom as well as high aerodynamic efficiency methods can be applied to the conceptual design of a supersonic-cruise aircraft. Two high-speed civil transport concepts were used as examples to illustrate the application of this engine-nacelle integration methodolog...
Keywords: FUZZY SYSTEMS; CLUMPS; COGNITION; CONTINUOUS RADIATION; DECISION THEORY; PROBABILITY THEORY; SENSE ORGANS; VISUAL PERCEPTION; WORDS (LANGUAGE); DATA COMPRESSION; DATA PROCESSING; HUMAN PERFORMANCE; LANGUAGES; MENTAL PERFORMANCE; COMPUTER PROGRAMS; ANALOGIES; BRAIN
Downloads: 81
[texts]Fuzzy Networks for Complex Systems - Alexander Gegov
Fuzzy Networks for Complex Systems
Keywords: node; nodes; fuzzy; operand; boolean; output; merging; described; matrix; feedback; boolean matrix; topological expression; operand node; fuzzy networks; binary relation; product node; fuzzy systems; temporary node; single equivalent; fuzzy sets
Downloads: 64
[texts]Mining and Control of Network Traffic by Computational Intelligence - Federico Montesino Pouzols, Diego R. Lopez, Angel Barriga Barros
Mining and Control of Network Traffic by Computational Intelligence
Keywords: fuzzy; network; traffic; internet; systems; inference; models; prediction; tcp; control; fuzzy inference; network traffic; inference systems; traffic load; time series; congestion control; prediction horizon; fuzzy systems; traffic control; active queue
Downloads: 140
[texts]Tropical Rainfall Distributions Determined Using TRMM Combined with other Satellite and Raingauge Information - Adler, Robert F.
Abstract A technique is described to use Tropical Rain Measuring Mission (TRMM) combined radar/radiometer information to adjust geosynchronous infrared satellite data (the TRMM Adjusted GOES Precipitation Index, or TRMM AGPI). The AGPI is then merged with rain gauge information (mostly over land; the TRMM merged product) to provide fine- scale (1 deg latitude/longitude) pentad and monthly analyses, respectively...
Keywords: PARTICLE IMAGE VELOCIMETRY; UNSTEADY FLOW; STABILITY; SPATIAL RESOLUTION; REAL TIME OPERATION; IMAGE RESOLUTION; FUZZY SYSTEMS; FEEDBACK; DATA REDUCTION; CENTRIFUGAL COMPRESSORS; COMPUTER PROGRAMS; PROCEDURES; VELOCITY MEASUREMENT; FLOW CHARACTERISTICS; IMAGE PROCESSING; DATA ACQUISITION; TURBOMACHINERY; HIGH SPEED
Downloads: 66
[texts]Finite element based micro-mechanics modeling of textile composites - Glaessgen, E. H.
Textile composites have the advantage over laminated composites of a significantly greater damage tolerance and resistance to delamination. Currently, a disadvantage of textile composites is the inability to examine the details of the internal response of these materials under load. Traditional approaches to the study fo textile based composite materials neglect many of the geometric details that affect the performance of the material...
Keywords: ARTIFICIAL INTELLIGENCE; DECISION MAKING; DISTRIBUTED PROCESSING; EDUCATION; ELECTROMAGNETIC INTERACTIONS; FUZZY SYSTEMS; MOLECULAR BEAM EPITAXY; PARALLEL PROCESSING (COMPUTERS); QUALITY CONTROL; ROBOTICS; SOFTWARE DEVELOPMENT TOOLS; C (PROGRAMMING LANGUAGE); SPACE SHUTTLES; SPACE STATION FREEDOM; COMPUTERIZED SIMULATION; CONFERENCES; EXPERT SYSTEMS; REAL TIME OPERATION; APPLICATIONS PROGRAMS (COMPUTERS); COMPUTER AIDED DESIGN; COMPUTER PROGRAMMING
Downloads: 126
[texts]Variable Automata as Discrete Descriptions of Homeostasis, Morphogenesis, Cognition and Autopoiesis in Organismic Networks - I. C. Baianu, Ph.D.
The question of a variable `automaton', or an automaton with a varying internal structure goes back to Norbert Wiener's suggestion in his book on ``The Human Use of Human Beings" (Cybernetics and Society, 1954). However, in his popular book, Wiener did not attempt any formal, or mathematical, definition of a `variable automaton'. Because the state space S of a standard, rigid automaton (or sequential machine/Turing machine) is known to have a semigroup (or monoid) structure, one may consider as ...
Keywords: ariable automata; variable groupoids; quantum automata; quantum groupoids; cybernetics; Neurocybernetics; Genomis; Interactomics; input-output descriptions; fuzzy systems and biological variability; bio-fuzziness; Metabolic-replication systems; homeostasis; autopoiesis; cell division; organismic relational biology; supercategories of variable automata; biodynamics; learning neural nets; nuclear transplant experiments; ontogeny and morphogenesis; philogeny and evolution of organisms and species
Downloads: 164
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